SOURCE

var a=["z","v","bbb","wet"];
var yzq=a.length;
document.write(yzq+"<br/>");

var b=a.slice(0,2);
document.write(b+"<br/>");

var c=a.unshift("yyy");
var d=a.push("oo","ggs");
document.write(c+"<br/>");
document.write(d+"<br/>");
document.write(a+"<br/>");

var e=a.shift();
var f=a.pop();
document.write(e+"<br/>");
document.write(f+"<br/>");
document.write(a+"<br/>");

document.write("对字符串进行升序的排序<br/>");
document.write(a.sort());

var numa=[3,8,12,4,0,33];

function upCompare(left,right){
    if(left-right>0){
        return 1;
    }
    if(left-right==0){
        return 0;
    }
    if(left-right<0){
        return -1;
    }
}
function downCompare(left,right){
    if(left-right>0){
        return -1;
    }
    if(left-right==0){
        return 0;
    }
    if(left-right<0){
        return 1;
    }
}
document.write("打印排序前的数字数组"+numa+"<br/>");
document.write("打印排序后的数字数组"+numa.sort(upCompare)+"<br/>");
document.write("打印排序后的数字数组"+numa.sort(downCompare)+"<br/>");


var g=a.reverse();
document.write(g+"<br/>");
document.write(a.join("//"));

document.write("给字符添加尖括号<br/>");
function addAngleBracket(strValue){
    var strArr=strValue.split("");
    console.log(strArr);
    var strTempValue=strArr.join("><");
    console.log(strTempValue);
    strArr=strTempValue.split("");
    strArr.unshift("<");
    console.log(strArr);
    strArr.push(">");
    console.log(strArr);
    return strArr.join("");
}
var strValue = "绿叶学习网";
document.write(strValue+"<br/>");
document.write(addAngleBracket(strValue));